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Revenue from Contracts with Customers - Disaggregates revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | $ 265,894 |  |
Gain on sale of leased equipment |  |  |  |  |  |  |  |  | 6,944 | $ 4,929 | $ 3,482
Revenue |  |  |  |  |  |  |  |  | 87,009 | 80,189 | 57,091
Total revenue | $ 118,190 | $ 80,958 | $ 78,702 | $ 70,497 | $ 63,189 | $ 65,861 | $ 67,844 | $ 77,946 | 348,347 | 274,840 | 207,274
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71,141 |  |
Managed services |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,303 |  |
Other revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65 |  |
Leasing and Related Operations | Other revenue | Other Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,300 |  |
Operating Segments | Leasing and Related Operations |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | 265,894 |  |
Gain on sale of leased equipment |  |  |  |  |  |  |  |  | 6,944 | 4,458 | 3,246
Revenue |  |  |  |  |  |  |  |  | 87,009 | 80,189 | 57,091
Total revenue |  |  |  |  |  |  |  |  | 307,263 | 245,003 | 192,278
Operating Segments | Leasing and Related Operations | Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,122 |  |
Operating Segments | Leasing and Related Operations | Managed services |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,303 |  |
Operating Segments | Spare Parts Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  | 471 | 236
Total revenue |  |  |  |  |  |  |  |  | 42,746 | 31,210 | 16,631
Operating Segments | Spare Parts Sales | Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 41,019 |  |
Operating Segments | Spare Parts Sales | Other revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,727 |  |
Eliminations |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (1,662) | $ (1,373) | $ (1,635)
Eliminations | Other revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ (1,662) |  |

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